Upgrade GitHub Actions

Author: rossmacarthur

.github/workflows/build.yaml

@@ -9,10 +9,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-node@v3
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
       with:
-        node-version: '18'
+        node-version: '20.x'
     - run: npm ci
     - run: npm run lint
     - run: npm run build
@@ -23,7 +23,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setup just
       uses: ./
       env:
@@ -40,7 +40,7 @@ jobs:
         just-version: [0.5.11, 0.6.1, 0.7.3, 0.8.7, 0.9.9, 0.10.7, 0.11.2, 1.5.0, 1.23.0]
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Run self
       uses: ./
       with: